AS Chemistry electron configuration help Watch

rfours
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On a chemistry unit 1 past paper it asked for the electron configuration of a rubidium atom, which has a proton number of 37.

I wrote, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d1
However the answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

I understand that rubidium is in group 1 and the s block so 5s1 makes sense, but I thought that there were the 4d and 4f sub-shells before the 5s one so I'm confused why it jumps from 4p to 5s?
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samb1234
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(Original post by rfours)
On a chemistry unit 1 past paper it asked for the electron configuration of a rubidium atom, which has a proton number of 37.

I wrote, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d1
However the answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

I understand that rubidium is in group 1 and the s block so 5s1 makes sense, but I thought that there were the 4d and 4f sub-shells before the 5s one so I'm confused why it jumps from 4p to 5s?
It's exactly the same reason the 4s is filled before the 3d
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EmBem03
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(Original post by rfours)
On a chemistry unit 1 past paper it asked for the electron configuration of a rubidium atom, which has a proton number of 37.

I wrote, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d1
However the answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

I understand that rubidium is in group 1 and the s block so 5s1 makes sense, but I thought that there were the 4d and 4f sub-shells before the 5s one so I'm confused why it jumps from 4p to 5s?
The 4d orbital has a slightly higher energy level than the 5s orbital so the 5s orbital fills first (just as with the 4s and 3d orbitals earlier on, which you have correctly filled in.)
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rfours
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Thank you!
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